Coding task support at tasks-viewer UI.

[clain-atomi]

1. Open any task at /landing
2. Click take part button
3. Go to mongodb atlas with creds
   [email protected]
   !Youshallnotpass534
4. find your event in events collection
5. find eventParticipations array, check 'isApproved' in all items.
6. Return to your event at gandalf, you'll see open event button, click it. It will be your starting point.

The task goal is to check if selectedTask type is text type, so render solution question as text, and show wysiwyg editor (already implemented), to allow user write answer.
Also add 'submit' button

Code editor is already implemented, also code editor switcher too as i remember. Please check #120 for solutions and realization. Stan doing pretty same job.